Milling Chuck Taper Size CAT40 Hole Dia 1 in Nose Dia 2.3600 in Collet Series KM1 Projection 105.00mm Coolant Fed Coolant Through Bore Depth 2.3200 in to 3.1500 in Clamping Range 1/8 in to 1 in Features 140 Percent More Bearing Surface than Competitor Milling Chucks For Quiet and Stable Heavy Milling Nikken Patented Design Nut Body Contact Nose Clamping and Anti-Vibration Mechanism Thick Body and Internal Slots Provide Extremely Strong Chucking Torque and Rigidity